Gaza militants violated laws of war by launching hundreds of rockets at Israeli civilians during last month's fighting, Human Rights Watch said in a release Monday.

The Israeli military said 1,500 rockets were fired at Israel during the eight-day offensive against Gaza militants, including the first rockets from the Gaza Strip to strike the Tel Aviv and Jerusalem areas.

"Palestinian armed groups made clear in their statements that harming civilians was their aim," said Sarah Leah Whitson, Middle East director at the New York-based rights group. "There is simply no legal justification for launching rockets at populated areas."

Hamas, the Islamist group that controls Gaza, said it would comment on the report after its legal experts review it. The Israeli military did not address the substance of the report.

Last week, Human Rights Watch said in a similar report that Israel violated laws of war in the same offensive by attacking journalists and media facilities in Gaza. Two Palestinian cameramen were killed and at least 10 media personnel were wounded in the Israeli operation.